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I G. MOWILLIAM. Safety Attachment for Steam Boilers.

WITNESSES ATTORNEYS.

INVENTOR N-PUERS, PHDTO-LITNDGRAPIIER, WASHINGTON. D. C-

Patented June 22,188'0J UNITED STATES PATENT OFFICE,

BYRON RIDER, OF FITCH BAY, CANADA.

SAFETY ATTACHMENT FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 229,160, dated June 22, 1880.

.Application filed December 15,' 1879. v

To all whom it may concern:

Be itknown that I, CHARLES MGWILLIAM, of .Georgeville, Province of Quebec, Dominion of Canada, have invented a new and Improved Safety Attachment for Steam-Boilers and I do hereby declare that the following is a full, clear, and exact description of the same.

The object of my invention is to provide an to improvement in ithe class of automatic devices for preventing explosion of steam-boilers by reason of accidental low water or too high steam-pressure. To this end I attach to a steam-boiler a small chamber or tank, which communicates with the former by means of steam and water pipes, and is so located that the water-level will always be the same in both.

I provide such tank with a float and valve mechanism, which is so constructed and arranged that in case the water shall fall below a certain level the float will fall also, so that its weight being added to that already sustained by the valve will open the latter automatically and allow discharge of water upon the fire in the boiler-furnace, thereby extinguishing it partly or wholly, and consequently removing the danger of explosion or injury to the boiler.

In accompanying drawing, forming part of this specification, I show a vertical central section of my apparatus and a front elevation of a boiler to which it is attached.

The water chamber or tank A may have any approved form; but it requires to be 5 placed in such local relation to the boiler B and so connected therewith by means of steampipe 0 and water-pipe O that the steam-pressure and water-level will be the same in one as the other. As shown in the drawing it is attached to the end of the boiler.

' An opening is formed in the bottom of the tank A, and a valve-casin g, D, applied thereat, in which is located a valve, E, having apend ent stem. From said casing -D a pipe, 11,

5 leads into the boiler furnace. When said valve E is raised or held up against its seat, as shown in full lines, no water can escape from the tank Ainto the pipe F; but when said valve is depressed and removed from its seat, as shown in dotted lines, water escapes into the pipe F and discharges upon the fire in the furnace, thereby dampening or wholly extinguishing it, and almost instantly checking the generation of steam, and reducing steam-pressure, so that the boiler cannot pos- 5 5 sibly explode.

To enable this desired operation of the valve E to take place when the steam-pressure is too great in tank and boiler, I support the valve on the short arm of a weighted pivoted 6o lever, G. L

The weight H may be placed at the point required to allow the valve to yield downward when the pressure of water on its face hecomes too great by reason of the steam-press ure in the steam-space above the water.

The means for depressing the valve E to allow water to be discharged into the fire-box when the water in the tank and boiler becomes too low for safety consist of the following parts, arranged within the tank,to wit: a lever,

I, a float, J, sliding on a rod, K, suspended from the free end of said lever, and a rod, L, which rests on the valve E and supports the float-lever in horizontal position, as shown in full lines.

The ball-float J, being of less specific gravity than its bull? of water, is but partly immersed in the latter, and rises and falls with it. When the water-level falls the float will slide down on rod K but its descent will be arrested by the disk or head a on said rod, so that the continued fall of the water will cause the weight of the float to be imposed more and more on the lever I, and thereby correspondingly increase the pressure of its supporting-rod K on the escape-valve E until the latter is forced open and allows discharge of water upon the fire, as before described. In other words, the float mechanism will open the valve whenever the downward pressure overcomes the upward pressure therein due to the action of the weighted lever G.

The apparatus thus operates automatically, either for high steam-pressure or low porting said lever on the valve, and a pipe 10 water, and constitutes areliable safety attachleading to the fire-box, substantially as shown nient tor'steani-boilers of various classes. and described, to form a safety attachment What I claim isfor the boiler as specified.

5 The combination with a steam-boiler and furnace or fire-box therefor, of a water-chani- CHARLES MCWILLIAM' ber, a weighted valve applied to the bottom Witnesses: of the latter, a float-lever having a pendent E. B. DOLLOFF, rod provided with head a, a float, a rod sup- N. T. SHEAFE. 

